debug.c
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//
// Created by imanol on 12/26/16.
//
#include <malloc.h>
#include <string.h>
#include "debug.h"
//uint32_t cycle_count = 0;
uint8_t breakpoint = 1;
uint16_t breakpoints[0xFF];
uint16_t nbpoints = 0;
char lastchoice = 0;
void load_state(char *filename)
{
FILE *state = fopen(filename,"r");
uint16_t regsdump[NUM_REGISTERS+1];
uint16_t memdump[MEMSIZE];
uint16_t *stackdump;
uint32_t stacksize, stackpos;
fread(regsdump,sizeof(uint16_t),NUM_REGISTERS+1,state);
fread(memdump,sizeof(uint16_t),MEMSIZE,state);
stackpos = ftell(state);
fseek(state,0,SEEK_END);
stacksize = (ftell(state) - stackpos)/sizeof(uint16_t);
stackdump = calloc(stacksize,sizeof(uint16_t));
fseek(state,stackpos,SEEK_SET);
fread(stackdump,sizeof(uint16_t),stacksize,state);
fclose(state);
load_regs(regsdump);
load_memory(memdump);
stack_load(stackdump,stacksize);
free(stackdump);
}
void save_state(char *filename)
{
FILE *state = fopen(filename,"w");
uint16_t regsdump[NUM_REGISTERS+1];
uint16_t memdump[MEMSIZE];
uint16_t *stackdump;
uint32_t stacksize;
dump_regs(regsdump);
dump_memory(memdump);
stacksize = stack_dump(&stackdump);
fwrite(regsdump,sizeof(uint16_t),NUM_REGISTERS+1,state);
fwrite(memdump,sizeof(uint16_t),MEMSIZE,state);
fwrite(stackdump,sizeof(uint16_t),stacksize,state);
fclose(state);
free(stackdump);
}
void query()
{
//TODO discard stdin
uint8_t end = 0;
uint16_t bpoint;
uint16_t mempos;
char input[100] = {0};
char filename[32];
uint8_t reg;
uint8_t value;
while(!end)
{
printf("\n> ");
char command = 0;
fgets(input,100,stdin);
command = input[0];
if (command != '\n')
{
lastchoice = command;
}
else
{
command = lastchoice;
}
switch (command)
{
case 'b':
sscanf(input,"b %d\n",&bpoint);
fprintf(stderr,"Set breakpoint %d to %d",nbpoints,bpoint);
breakpoints[nbpoints] = bpoint;
nbpoints = nbpoints + 1 % 0xFF;
break;
case 'd':
sscanf(input,"d %d\n",&bpoint);
fprintf(stderr,"Deleted breakpoint %d",bpoint);
breakpoints[bpoint] = 0;
break;
case 'c':
breakpoint = 0;
end = 1;
break;
case 'n':
end = 1;
break;
case 'r':
print_regs();
break;
case 'm':
sscanf(input,"m %d\n",&mempos);
fprintf(stderr,"%d: %02x\n",mempos,mem[mempos]);
break;
case 's':
sscanf(input,"s %s\n",filename);
save_state(filename);
fprintf(stderr,"Saved state as %s",filename);
break;
case 'l':
sscanf(input,"l %s\n",filename);
load_state(filename);
fprintf(stderr,"Loaded state as %s",filename);
break;
case 'w':
//FIXME ALREADY
sscanf(input,"w %d %d\n",®,&value);
fprintf(stderr,"Setting register %d to %d",reg,value);
regs[reg] = value;
break;
default:
break;
}
}
}
uint8_t in_breakpoint(uint16_t pc)
{
uint8_t i;
for(i = 0; i < nbpoints; i++)
{
if(breakpoints[i] == pc)
{
return 1;
}
}
return 0;
}
uint16_t fetch_debug()
{
uint16_t value = mem[pc++];
/*if(breakpoint)
{
fprintf(stderr,"0x%2x (0x%2x): %d", pc, pc * sizeof(uint16_t),value);
fprintf(stderr," cycle: %d\n", cycle_count++);
}*/
return value;
}
void translate_args(uint16_t a1, uint16_t a2, uint16_t a3, char *arg1, char *arg2, char *arg3)
{
if(a1 > MAX_INT)
{
sprintf(arg1,"r%d",a1-(MAX_INT+1));
}
else
{
sprintf(arg1,"%d",a1);
}
if(a2 > MAX_INT)
{
sprintf(arg2,"r%d",a2-(MAX_INT+1));
}
else
{
sprintf(arg2,"%d",a2);
}
if(a3 > MAX_INT)
{
sprintf(arg3,"r%d",a3-(MAX_INT+1));
}
else
{
sprintf(arg3,"%d",a3);
}
}
void print_instruction(uint16_t opcode, uint16_t a1, uint16_t a2, uint16_t a3)
{
char arg1[10];
char arg2[10];
char arg3[10];
translate_args(a1,a2,a3,arg1,arg2,arg3);
switch(opcode)
{
case HALT:
fprintf(stderr,"HALT\n");
break;
case MOV:
fprintf(stderr,"MOV %s %s\n",arg1,arg2);
break;
case PUSH:
fprintf(stderr,"PUSH %s\n",arg1);
break;
case POP:
fprintf(stderr,"POP %s\n",arg1);
break;
case TEQ:
fprintf(stderr,"TEQ %s %s %s\n",arg1,arg2,arg3);
break;
case TGT:
fprintf(stderr,"TGT %s %s %s\n",arg1,arg2,arg3);
break;
case JMP:
fprintf(stderr,"JMP %s\n",arg1);
break;
case JNZ:
fprintf(stderr,"JNZ %s %s\n",arg1,arg2);
break;
case JZ:
fprintf(stderr,"JZ %s %s\n",arg1,arg2);
break;
case ADD:
fprintf(stderr,"ADD %s %s %s\n",arg1,arg2,arg3);
break;
case MUL:
fprintf(stderr,"MUL %s %s %s\n",arg1,arg2,arg3);
break;
case MOD:
fprintf(stderr,"MOD %s %s %s\n",arg1,arg2,arg3);
break;
case AND:
fprintf(stderr,"AND %s %s %s\n",arg1,arg2,arg3);
break;
case OR:
fprintf(stderr,"OR %s %s %s\n",arg1,arg2,arg3);
break;
case NOT:
fprintf(stderr,"NOT %s %s\n",arg1,arg2);
break;
case LOAD:
fprintf(stderr,"LOAD %s %s\n",arg1,arg2);
break;
case STOR:
fprintf(stderr,"STOR %s %s\n",arg1,arg2);
break;
case CALL:
fprintf(stderr,"CALL %s\n",arg1);
break;
case RET:
fprintf(stderr,"RET\n");
break;
case OUT:
fprintf(stderr,"OUT %s\n",arg1);
break;
case IN:
fprintf(stderr,"IN %s\n",arg1);
break;
case NOP:
fprintf(stderr,"NOP\n");
break;
default:
fprintf(stderr,"UNK %d\n", opcode);
break;
}
}
void debug_program()
{
memset(breakpoints,0x00,0xFF);
uint16_t arg1;
uint16_t arg2;
uint16_t arg3;
for(;;)
{
if(in_breakpoint(pc) || breakpoint)
{
breakpoint = 1;
fprintf(stderr, "%d: ", pc);
print_instruction(mem[pc], mem[pc+1], mem[pc+2], mem[pc+3]);
query();
}
uint16_t opcode = fetch_debug();
decode_instruction(opcode, &arg1, &arg2, &arg3);
if (execute_instruction(opcode, arg1, arg2, arg3))
{
return;
}
}
}